Improvement in compositions for coating metals



Iran STATES AARON B. BROWN AND WENDELL PATENT OFFICE.

1?. BROWN, OF WORCESTER, MASS.

IMPROVEMENT lN COMPOSITIONS FOR COATING METALS.

Specification forming part of Letters Patent No. 22 I ,028, datedOctober 28, 1879; application filed July 16, 1879.

To all whom it may concern:

Be it known that we, AARON B. BROWN and WENDELL 1?. BROWN, both ofWorcester, in the county of Worcester and State of Massachusetts, haveinvented certain new and useful Improvements in Ooatin g for Metals toPrevent Rust and Corrosion, of which the following is a full, clear, andexact description.

This invention relates to a coating for metals for preventing their rustor corrosion from exposure to air and moisture and it is more especiallydesigned for the coating of metals which have been manufactured intomachinery and other useful contrivances, 850., to prevent rust orcorrosion of such manufactured metals in transportation or otherwiseexposed to air and moisture.

Experience and experiments show that a coating for this purpose to bepracticable and efficient must have certain characteristics or features,such as the following: It must be impervious to air and moisture andmust have consistency and body enough to completely cover the surface tobe protected. It must be pliant and elastic, so as to expand andcontractwith the metal, and without breaking, cracking, or checking. Itmust be adhesive and of such an adhesive nature thatits expansion andcontraction will not affect the same to separate it from contact withand adhesion to the metal surface. It must be soft and pliable, andcapable of drying readily, and of easy removal when so desired.

This improved coating has the above-named features, and it is composedof ingredients as follows, to wit: one-fourth (i) pound indiarubber,one-eighth (g9) pound guin-kauri, onefourth (9;) pound gum dammar, andthreefourths (2) pound wax.

These several ingredients are dissolved in benzole, or any othersuitable solvent, and for such purpose one (1) gallon of benzole issufficient, and in practice they are dissolved separately, and thenmixed together, the whole making a liquid varnish suitable to be appliedby a brush or a cloth to the metal surface.

The india-rubber is impervious to air and moisture, gives pliability andelasticity, and renders the varnish, when applied as stated, capable ofexpanding and contracting with the metal.

The gum-kau'ri and the (laminar give adhesiveness and body and thicknessto the varnish, and the latter gum makes it dryreadily; but if either ofthese two gums were used in sufficient quantity to give the body andthickness desired, the varnish, when dry, would be hard and brittle; andtherefore to obviate this wax is used, which gives all the body andthickness desired, and maintains the proper pliability and elasticity ofthe varnish when 4 dry. It is preferable to use Japanese wax.

The varnish or coating above described applied to metal surfacesprotects them against rust or corrosion, and as it is constituted haselasticity, pliability and imperviousness to. air and moisture,adhesiveness and body or thickness, and possesses the same in such adegree that it completely covers and adheres to the surface, does notcrack, break, or separate therefrom on exposure, preserves the surfaceagainst rust or corrosion from the atmosphere and moisture, and isreadily removed by simply washing it with spirits of naphtha or spiritsof turpentine.

In using this coating it is desirable to first wash the metal surfacewhich is to be coated with an alkaline or other wash which is capable ofremoving and checking the tendency of the surface to rust and corrode.

Having thus described our invention, what we claim, and desire to secureby Letters Patent, is-

A coating for metal to prevent rust and cor rosion from exposure to airand moisture, the

same being composed of india-rubber, gumkaur-i, gum-dammar, and wax, thewhole dissolved in benzole, substantially in the propor tions specified.

AARON B. BROWN. WENDELL P. BROWN. Witnesses:

HORACE L. BRIGGS, L. C. PARKS.

